Include rules for official format values

[jparise]

User story.
As a spec author, I would like to know when a format value isn't officially supported by OAS.

Is your feature request related to a problem?
OAS3 defines a specific set of format values for each type: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#data-types

It's helpful to know when a format value falls outside the supported set.

Describe the solution you'd like
Here are some rules we've been using locally:

  oas3-integer-format:
    description: Must use an official integer format
    documentationUrl: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#data-types
    given: $..properties[?(@.type == 'integer')]
    severity: error
    then:
      field: format
      function: enumeration
      functionOptions:
        values:
          - int32
          - int64
  oas3-number-format:
    description: Must use an official number format
    documentationUrl: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#data-types
    given: $..properties[?(@.type == 'number')]
    severity: error
    then:
      field: format
      function: enumeration
      functionOptions:
        values:
          - float
          - double
  oas3-string-format:
    description: Must use an official string format
    documentationUrl: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#data-types
    given: $..properties[?(@.type == 'string')]
    severity: error
    then:
      field: format
      function: enumeration
      functionOptions:
        values:
          - byte
          - binary
          - date
          - date-time
          - password